How to easily test cocoa app on different version of mac osx?

How to easily test cocoa app on different version of mac osx?

References

Reference NO 1

http://stackoverflow.com/questions/15204063/how-to-easily-test-cocoa-app-on-different-version-of-mac-osx

Reference NO 2

http://stackoverflow.com/questions/17727659/testing-cocoa-app-targeted-for-multiple-plaforms

Reference NO 3

http://cocoadevcentral.com/articles/000067.php

Reference NO 4

http://developer.apple.com/library/ios/DOCUMENTATION/Cocoa/Conceptual/CocoaFundamentals/WhatIsCocoa/WhatIsCocoa.html

Reference NO 5

http://mattgemmell.com/source

Reference NO 6

http://code.google.com/p/cocoa-rest-client/

Reference NO 7

http://www.cocoawithlove.com/2009/09/building-for-earlier-os-versions-in.html

Reference NO 8

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